A cleric of the Knowledge Domain who has reached level 6 has access to Channel Divinity: Read Thoughts:
At 6th level, you can use your Channel Divinity to read a creature's thoughts. You can then use your access to the creature’s mind to command it.
As an action, choose one creature that you can see within 60 feet of you. That creature must make a Wisdom saving throw. If the creature succeeds on the saving throw, you can’t use this feature on it again until you finish a long rest.
If the creature fails its save, you can read its surface thoughts (those foremost in its mind, reflecting its current emotions and what it is actively thinking about) when it is within 60 feet of you. This effect lasts for 1 minute.
During that time, you can use your action to end this effect and cast the suggestion spell on the creature without expending a spell slot. The target automatically fails its saving throw against the spell.
Read Thoughts has a range of 60 feet, but suggestion only has a range of 30 feet.
What happens if a cleric uses an action to end Read Thoughts while the target is more than 30 feet away? Does suggestion fail?